It's a defilement of the body. And as far as the legality of it. God's inspired word says at Romans 13:1-4 Let every soul be in subjection to the superior authorities, for there is no authority except by God; the existing authorities stand placed in their relative positions by God. Therefore he who opposes the authority has taken a stand against the arrangement of God; those who have taken a stand against it will receive judgment to themselves. For those ruling are an object of fear, not to the good deed, but to the bad. Do you, then, want to have no fear of the authority? Keep doing good, and you will have praise from it; for it is God's minister to you for your good. But if you are doing what is bad, be in fear; for it is not without purpose that it bears the sword; for it is God's minister, an avenger to express wrath upon the one practicing what is bad.
Corrupt or not, God allows them to stand in their place of authority to keep chaos from ruling. To take a stand against the authorities is to go against God the Supreme Authority. We do not know the proper uses of all that God has created, and this world right now is not as it should be, Satan is called the god of this system of things and the whole world lies in his power. Just because God created something does not necessarily mean we should partake of it. God created the mushroom/toadstool known as the Angel of Death for which there is no antidote for it's poison, so since God created it would you fry one up and eat it?